Migrate Erlang samples to use OAS 3 spec

[wing328]

Migrate Erlang samples to use OAS 3 spec

PR checklist

• Read the contribution guidelines.
• If contributing template-only or documentation-only changes which will change sample output, build the project before.
• Run the shell script(s) under ./bin/ (or Windows batch scripts under.\bin\windows) to update Petstore samples related to your fix. This is important, as CI jobs will verify all generator outputs of your HEAD commit, and these must match the expectations made by your contribution. You only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the code or mustache templates for a language ({LANG}) (e.g. php, ruby, python, etc).
• File the PR against the correct branch: master, 4.3.x, 5.0.x. Default: master.
• Copy the technical committee to review the pull request if your PR is targeting a particular programming language.

[wing328]

CI reports the following errors:

===> Compiling idna
===> Compiling parse_trans
===> Compiling certifi
===> Compiling hackney
===> Compiling ctx
===> Compiling petstore
===> Compiling src/petstore_utils.erl failed
src/petstore_utils.erl:81: syntax error before: '}'

src/petstore_utils.erl:12: function update_params_with_auth/3 undefined

src/petstore_utils.erl:64: function auth_with_prefix/3 is unused

[ERROR] Command execution failed.
org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
    at org.apache.commons.exec.DefaultExecutor.executeInternal (DefaultExecutor.java:404)
    at org.apache.commons.exec.DefaultExecutor.execute (DefaultExecutor.java:166)
    at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:804)
    at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:751)